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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 300px; height: 200px; border: 15px solid coral; animation: mymove 5s infinite; } @keyframes mymove { 50% {border-right-color: lightblue;} } </style> </head> <body> <h1>border-right-color 动画</h1> <p>逐渐将 border-right-color 属性从珊瑚色更改为浅蓝色，然后再更改回来：<p> <div id="myDIV"></div> <p><b>注意：</b> CSS 动画在 Internet Explorer 9 和更早版本中不起作用。</p> </body> </html>